<template>
  <div class="todo-container">
    <div class="todo-wrap">
      <Header :addTodo="addTodo" :todoList="todoList" />
      <List
        :todoList="todoList"
        :updateById="updateById"
        :deleteById="deleteById"
      />
      <Footer
        :todoList="todoList"
        :updateAllChecked="updateAllChecked"
        :deleteAllChecked="deleteAllChecked"
      />
    </div>
  </div>
</template>

<script>
import Header from "@/components/Header.vue";
import List from "@/components/List.vue";
import Footer from "@/components/Footer.vue";
export default {
  name: "App",
  components: { Header, List, Footer },
  data() {
    return {
      todoList: [],
    };
  },
  mounted() {
    this.todoList = JSON.parse(localStorage.getItem("todoList")) || [];
  },
  watch: {
    todoList: {
      deep: true,
      handler() {
        localStorage.setItem("todoList", JSON.stringify(this.todoList));
      },
    },
  },
  methods: {
    //添加元素
    addTodo(newTodo) {
      this.todoList.unshift(newTodo);
    },

    //修改元素
    updateById(id) {
      this.todoList.forEach((item) => {
        if (item.id === id) {
          item.isChecked = !item.isChecked;
        }
      });
    },

    //删除元素
    deleteById(id) {
      this.todoList = this.todoList.filter((item) => item.id !== id);
    },

    //修改全部元素
    updateAllChecked(value) {
      this.todoList.forEach((item) => {
        item.isChecked = value;
      });
    },

    //删除全部元素
    deleteAllChecked() {
      this.todoList = this.todoList.filter((item) => !item.isChecked);
    },
  },
};
</script>

<style scoped>
/*base*/
body {
  background: #fff;
}

.btn {
  display: inline-block;
  padding: 4px 12px;
  margin-bottom: 0;
  font-size: 14px;
  line-height: 20px;
  text-align: center;
  vertical-align: middle;
  cursor: pointer;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 1px 2px rgba(0, 0, 0, 0.05);
  border-radius: 4px;
}

.btn-danger {
  color: #fff;
  background-color: #da4f49;
  border: 1px solid #bd362f;
}

.btn-danger:hover {
  color: #fff;
  background-color: #bd362f;
}

.btn:focus {
  outline: none;
}

/*app*/
.todo-container {
  width: 600px;
  margin: 0 auto;
}
.todo-container .todo-wrap {
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 5px;
}
</style>